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    Blown up two laptops

    Okay, so I'm working on a cnc control board project with the Espduino 32 bit board and a cnc shield. Everything is okay, I have stepper motors running as they should and all is gravy. Then, working away I notice the psu for the cnc shield has the power led flashing, my laptop screen blurs and...
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    Desktop cnc laser 32bit upgrade

    Hi,, I have the generic Chinese cnc laser which comes with an 8 bit controller running grbl 1.1. I would like to upgrade the machine to 32 bit but there is a lack of outright cnc laser boards which are 32 bit. There is one on the Ortur but to be honest it is not appealing as the stepper driver...
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    Any guitar builders on here?

    First of all I'm not a musician, I can't play the guitar, but I have a yen to build a 3 string fretless bass guitar of the "shovel" variety or some such heresy. I plan to use some of an old pitch pine pew for neck and body but am totally in the dark as to wiring the damned thing. I've had a look...
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    Fixed interval Jacob's Ladder?

    Bit of a strange one but I would like to make a battery powered Jacob's Ladder or even have it run off a step down transformer. Apparently part of the circuit responsible burns out if run continuously. What would be useful would be the ability to switch the current on and off at a suitable...
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    Possible switch overload?

    I've bought a toggle switch which I intend to use to control the output from two led drivers. https://www.ebay.co.uk/itm/12V-ILLUMINATED-LED-ON-OFF-TOGGLE-SPST-SWITCH-AIRCRAFT-MISSILE-FLIP-UP-COVER-CAR/281145655206?ssPageName=STRK%3AMEBIDX%3AIT&var=580343948971&_trksid=p2057872.m2749.l2649 The...
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    Difficulty measuring forward voltage for a LED

    I have a couple of LED's, both 12 volt or so and one is in fact a 3w cluster. I was toying with the idea of running one of them off a 12v battery but need to calculate the resistor value I would need, and for this I need the forward voltage. I got my multimeter out, which I admit is a cheapie...
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    How to power one or two of these clusters

    Hi, not had to worry about electrical stuff for a while but digging out an unfinished project I have come across a couple of led applications I have to finish. I bought a couple of these: https://www.joom.com/en/products/5ae6dcd88b2c3701f94ecfcc and am curious as to what sort of psu and circuit...
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    Power output from a mobile phone aux socket

    Obviously it has a sufficient output to drive ear buds, but just how large a speaker would it drive? I like the idea of extension speakers but find the quality of bluetooth audio garbage so "hard wired" is the preferred option for me and if I can get away without a built in amp that would be...
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    A simple one with LED strip

    Hi folks and thanks for reading. I want to make an edge lit polycarbonate nightlight for my new grandson's nursery and the best way would be to use led tape and a suitable driver or psu. Drivers tend to be expensive (I might plan to sell some of these if the first goes okay on our local market...
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    Old guy with a few questions

    Hi, as it says I'm an old guy with a few questions on things. back in the late 1990's I managed a factory making high end HMI panels that went onto Vickers warships and power plants amongst many places. Needless to say I know very little about electronics per se, my soldering definitely needs...
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